I thought the only difference between a sl and slx was the side panels..I just bought a 20 with the curvy side panels which I thought would be an slx but it only says sl on the sides..looked at the receipt and says slx...in the brochure its says slx but u look close at the boat its the same as mine sl with curvy panels..please help.. also I noticed the panels that cover the area above the pontoon are just plain aluminum and the boat that had 25" and that actually said slx had fancier ones that matched the edge of the boat...sorry for the long post lol